Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19bd4d782f753e7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 15:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07425d48c86717ddfff56b9def69be10 SHA-1: b8895eeda41722fe9bb434e00e35ca868cdd7665 SHA-256: f19bd4d782f753e7e1131d5e352d37f8abf8f25f1b9e91e4f4b48ccdcd845ef5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=bienvenue+au+qu%C3%A9bec+en+fran%C3%A7ais+pdf PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45b829633---39653674655.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lepojo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/jenefomopu.pdfIn PDF document text
    • https://biocoils.com/img/file/kawefevabuxawev.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906030605279.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/kalujepif.pdfIn PDF document text
    • https://beautydent.hu/editor_up/12668347075.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/niwidufa.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/84281399812.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354c0c18c9b---lorevulutivunutigepi.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/72813590339.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/nutelewebozekitiwewo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/79973937647.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/ganalosigekapofijulil.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/zipatiniwaximeno.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/49805920205.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vosotipuvobibikato.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907115548.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/jijejilabolasapenowaj.pdfIn PDF document text
    • https://matrixx.lu/images/lagumapowemebugokav.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/um3bovskfgcfh85ltefd5hd3rg/36325842790.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/silimofulidux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16988 bytes
SHA-256: 6fc442a82c4f295acf3e9dcb2dd323e43baf8829204bb342bef0349cafc4da1f
font_01_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 11204 bytes
SHA-256: 0d853a67f164c77757967eb6304db762c4e763fb078a271a6f44595c26913e45
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1